The app also enables elections officials to send out "push notifications" advising voters of any election-related changes and notify them of registration deadlines.

Colter said the app is also intended "to engage the now generation who rely on their mobile devices for information."

To actually cast their votes, citizens must still deliver a mail-in ballot to the elections office or a polling place or fill out a paper ballot on Election Day.

Colter traced the app back to Rousseau's introduction of the "going green" initiative, including online voter registration, to the Board of Supervisors in May 2013.

"Is there an app for that?" Supervisor Shirlee Zane asked, according to Colter, who took on the task of acquiring one.

The county contracted with Purple Forge, an Ottawa, Canada-based company, to develop and support the app for $20,000, using a template the firm had developed.

Purple Forge election apps are in use by Long Beach and six Canadian cities, including Vancouver and Victoria, British Columbia, said John Craig, a company co-founder.

"Everything we've done has been battle-tested" in Canadian elections, he said.

Mobile devices are more than a teen or millennial fixation, with 326.4 million wireless subscriber connections in the nation, according to CTIA-The Wireless Association.

Craig said 2010 was the "crossover year" in which people began accessing the Internet more frequently on mobile devices than on personal computers.

The trend has steadily increased to the point that minutes per day on mobile apps nearly equal minutes watching television, Craig said.

Colter said she knew of two counties — Sacramento and Santa Clara — that had set up their own elections apps.

"It's getting to the point where everybody's got to go online," she said.

You can reach Staff Writer Guy Kovner at 521-5457 or guy.kovner@pressdemocrat.com.

Candidates for Sonoma County Sheriff

Name: Mark Essick

Age: 48

Career: Sonoma County Sheriff’s Office for 23 years; had visible roles representing the Sheriff’s Office in the past; was a member of the community task force created in the wake of the 2013 Andy Lopez shooting